! ! ! ! ! ! ! ! ! ! !! ! ! ! !! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! Geological Survey And

º ' ' 094E 186 5

7 5

0 5

2 4

6365000 N º R R 5

1 1 º

8 6

00 6 6 094E 130 2 1 I 80 2

2 0 094E 096 1 127º05' 1600 V 1 V 1 E 16 R 00 L K ((94E963246 N E 1 1400 T O O 40 E O D O G G 0 94E965070 N (( 2 O 000 Geological Survey and Development Branch G ((94E963243 00 12 094E 218 1400 0 G OPEN FILE MAP 2004-4 140 00 94E961149 O 18 ((94E963237 D (( 1 160 6 (( 0 0 O (( (( 0 O (( 94E961062 1600 094E 001 O 1 T 1800 2 T 00 0 94E961137 (( 14 0 14 094E 206 00 1 00 6 14 GEOLOGY OF THE SAMUEL BLACK RANGE BETWEEN THE FINLAY RIVER AND THE 160 094E 205 0 x 0 0 1 1200 1 2 8 00 094E 212 0 ((94E963239 (( 0 94E961290(( ((94E963245 x (( 94E963236 (( TOODOGGONE RIVER, TOODOGGONE RIVER MAP AREA, NORTH-CENTRAL BRITISH COLUMBIA PARTS OF NTS 94E/2,6 and 7 94E961383 H 94E963225 (( (( TM (( (( x MOUNT

x GRAVES (( 94E963194 94E961382(( x (( 094E 207 Contribution to the Toodoggone Targeted Geoscience Initiative II - Mining Company Partnership 1200 x 94E963238(( BLm 094E 087 g x BL x x 1 x 800 x HTM 16 094E 208 00 094E 203 Geology by: Larry J. Diakow 1 0 BLg 1 4 0 P 20 00 6360000 N 14 0 Geochronology by: Richard Friedman, The University of British Columbia x x I

L 094E 209 x x 140 0 094E 007 x x L H x 094E 089 TS 094E 214 1 A 60 x Z 0 Scale 1:50 000 00 in progress 6 1 R x 03 LDI 27-1 S 012 00 x 94E963224 14 0 00 (( 0 18 (( A 4 x 2000 1 94E963193 M x kilometres H x TS 180 U x HTM 0 0 x 0 E HT 18 ( L

0 ! LAYERED ROCKS 16 0 94E961048 x 6 94E963242 12 x 1 (( 0 (( x B (( 0 94E961049 x x ((94E961080 (( (( x L x A 094E 155 x 94E963206 C x Z ((94E963235 LOWER JURASSIC (( 094E 156 196.9 "1.0 K 1800 Ar 1 in progress HAZELTON GROUP 600 P i l N o r t h 094E 040 x R G r i z 2 x Toodoggone formation x 094E 201 A Ar in progress 1 0 Unmapped bedded volcanic and minor sedimentary rocks. 6 180 N 0 HT 1 0 094E 237 G r i z 1 8 H G 1 0 TM 6 0 094E 017 E 0 0 0 x HTM 2 0 BLm 0 4 0 1 Conglomerate, sandstone and siltstone; green to maroon, clasts in conglomerate resemble hornblende andesite flows of unit HTM; thin succession locally x 0 x 0 HTcTC 0 57º20' HTc unconformable on unit HTS. (( x 2 ((94E963208 x 1 1 80 ((94E963207 094E 086 x 0 094E 154 1

x 0 Basalt and basaltic andesite sill or flow(?); purple, dark green, crowded plagioclase porphyritic texture, locally contains augite megacrysts up to 1.3cm long. 094E 153 x ! 094E 202 HTbTb

x x ((94E963226

0 1 x 00 BLm 8 94E963200 2 ! 14 0 ((94E963233 0 94E963195 (( (( Saunders member x x (( 6355000 N BLm 1 94E963234 ( 8 0 0 Dacite ash-flow tuff; grey-green, typically contains brohornblende and biotite, variably welded, distinctive flattened vitriclasts in more densely welded zones. 26 x HTS x 94E963199(( BLm x (( 16 Metsantan member 094E 083 0 x 14 0 00 094E 037 x x

094E 152 x x Andesite lava flows; grey-green to light purple, 15-25% plagioclase between 2 and 5mm long; chloritized hornblende prisms, trace quantities of biotite and

x 0 ! HTM 0 0

0 quartz phenocrysts. 094E 216 6

8 HTM x 1

12 1 x 094E 029 x x x 1600 x Duncan member 18 x HTc 0 2000 00 x 0 2 x x x 2 0 x x 1 00 x Lapilli tuffs with volcaniclastic-epiclastic interbeds; greenish with oxidized reddish sections, pyroclasts commonly consist of reddish brown andesite porphyries 600 (( HTD

x 1 1800

45 x 94E963232 0 mixed with plagioclase and up to 2% biotite and quartz crystal fragments; minor bedded sandstone, siltstone, maroon mudstone and rare conglomerate. BLm ! HTM x x ((94E963228 0 14 30 ! 1800 HTb 2000 BLm x 094E 217 S x BLg 00 Intraformational conglomerate locally marking the base of the Toodoggone formation; rounded pebbles to boulders dominated by "crowded" fine-grained 16 094E 063 A 1600 x 094E 213 HTc1 hornblende andesite porphyry, crudely layered thick beds with subordinate sandstone and siltstone interbeds. A solitary conglomerate locality contains HTM U 0 clasts of megacrystic basalt porphyry (unit Tv) and granitic rock. 0 2 8 THE H 0 1 TS N 0 x H ( 0 TS 0 1800 094E 151 0 PILLAR ( 6 94E963198 D 1 (( UPPER TRIASSIC ( x 0 0 E x 4 094E 042 1 TAKLA GROUP 1 2 0

R 094E 024 0 H ! 094E 215 x Tc 28

S 14 Basalt flows; dark green, characterized by augite and plagioclase phenocrysts, minor basaltic lapilli tuff; scarce megacrystic plagioclase porphyry basalt flows

m 00 BL! T ( v 16 HTS 0 1 containing plagioclase laths up to 2 cm long (distinctive flow member found locally near the top to the volcanic succession). 28 0 6

0 094E 026 1 xx 0

800 T ! v 14 B a k e r M i n e ( 12 94E963219 00 (( 94E963231 Sandstone and siltstone; dark olive green, dominated by augite and plagioclase grains; minor bedded sections within the lava flows. HTb (( Ts HTS HTc 0 x 180

HTS ( T v 27 ! H K TS x ((94E963218 MID-PENNSYLVANIAN TO LOWER PERMIAN 6350000 N F ASITKA GROUP C 1800 A x ( 094E 211 T v x 1 Limestone; off white, light grey weathering, recrystallized, massive to thickly bedded; occur as isolated roof pendants resting on the Duncan pluton. 6 U 00 094E 210 1 094E 027 00 O 16 Ar Av 800 x in progress L 94E963216 T v x (( N u b W e s t ( J 400 x Dacitic lapilli tuff, grey-green, green to dark purple, aphanitic greyish white fragments, rare accretionary lapilli tuff, minor flows exhibit faint laminae; occur as T x Ar in progressx x C 1 1 As 094E 072 8 094E 107 R thermally altered pendants on and adjacent to the Duncan pluton. (( 94E963210 0 ( (( 0 03 LDI 26-01 E 2 F E 000 94E963262 (( K 0 A (( ((94E963211 094E 200 140 1200

94E963209 U 094E 088 ((94E963215 INTRUSIVE ROCKS BLg ((94E963220 L 18 (( H 00 00 TS x 16 EARLY JURASSIC T Ar in progress 25 1 0 6 0 0 BLg 8 0 03 LDI 25-05 1 BLACK LAKE SUITE 094E 008 0 1 0 ! 8 14 18 ((94E963212 0 x 00 (( 0 0 x x ((94E963230 160 S h a s t a x x (( 16 x 0 x x x x 0 0 0 x 1 x x 0 0 Granodiorite, light pink, medium to coarse grained, inequigranular, subhedral plagioclase and intercrystalline potassium feldspar and quartz; 15-20% x H 4 x 6 4 TS ( 0 x x 1 1 BLg 0 combined mafics with modal hornblende exceeding biotite. Small to medium sized stocks. 00 094E 147 14 094E 050 x x x (( x Ar ((94E963196 x in progress B r e n d a x x x 94E963388(( x 56 30 (( ( D a w n E a s t x Monzonite, light to dark orange, medium to coarse-grained porphyritic texture, subhedral plagioclase and groundmass potassium feldspar, chloritized x (( 094E 148 (( x Ar BLm

x x ! ! in progress 57º15'

x x hornblende and biotite up to 15%, trace to 1% quartz phenocrysts. Typically as dikes up to 5 metres wide and less commonly as sills and small stocks.

94E963213 50 x x

x x x 55 HTc1 094E 039 x HTM N.W B r e c c i a ! ! x 094E 142 x ! 68 x ! 50 T HTc1 094E 146 40 0 ! BL 0 x 94E963272 ! m 0 6 094E 145 55 68 0 1 (( 50 H 4 Tc1 1 Symbols x HTS x ! x x ! ( x Limit of mapping x x Geological contact (defined, approximate,inferred) T v H x x x x 094E 140 TS x x H 0 Tc1 x 0

x x ( 6 Unconformity (defined, inferred)

. 1 x K x ! x Normal fault (ball on down dropped side; defined, inferred) L B a r i t e ( ( (( 6345000 N x 0 x 94E963387 ( 180 Reverse fault (defined, inferred) x BLm 10 V e i n s (( 0 x x x 0 Wrench fault (defined, inferred) T v 094E 106 8 0 HTD 1 0 x x 4 55 x Dike 1 K HTD H x T v TD 094E 133 15 x

C x ! 40 x Field station location v !

A x x x ! x x Bedding

L x HTc1 ! x x x x x x !

B x x x ! 094E 143 Regional Geochemistry Survey site ( RGS) 40 x (( 25 26 HTc1 x x 7 17 x BLg T v x x x MINFILE occurrence and reference number 094E 141 ! x ! ! H 094E 095 x TTM 0 x 094E 045 Age determination site 60 23 x 1 Ar/Ar Ar in progress x ! 20 x x T v x x x U/Pb HTc1 ! Z 201.3 ".5 Ma x 1 P i n e 6 x 94E963383 Landslide 0 A S 45 (( 0 094E 144 x (( S t u r d e e 1800 x 094E 016 Road (all weather, seasonal) ( x ! x V a l l e y x (( Flooded land A ((94E965049 A i r s t r i p S T v 32 94E963432 0 R 0 (( x 2 (( 94E963384 ! E 1 ( A V x x T v 94E963434 (( (( 094E 004 x A S 94E963386 00 T v V 094E 003 x 12 I 1 I 4 43 0 00 0 94E965047 R 0 18 0 0 0 x 6 x 4 094E 057 ! 1 094E 005 x 1 A V x BLm (( HTD x 1400 S x 094E 135 x T x DRYBROUGH 11 PEAK U 00 x H R 18 TS x !A S D E 094E 137 x HTS x 1 E 094E 149 600 x x 094E 134 x x 55 094E 125 18 18 ! 00 14 00 g T S 0 BL 6340000 N 0 R 094E 138 65 094E 104 1 ! 6 x x 0 II 0 094E 139 x x V x 1 094E 136 6 1 Ar 0 E 4 094E 058 E 0 ( 0 a 0 (( in progress 94E965027 Are R 94E963382 (( x (( ap E E l e c t r u m Y M

O G A M N x A A 94E963431 094E 128 T v

I R L (( 140 N (( x 0 1 K 6 0 E C N 0 A N L x C II B 1 x x 6

A 1 L 00 S A M U E 094E 129 F 4

A 0 S 1 x 0 6 x 0 DUNCAN PLUTON x 0 0 094E 047 0 (( 4 094E 132 1 94E965026 R 1 8 0 0 E 57º10'

S x 094E 131

O A 00 S Ar 16 x in progress

U T 03 LDI 29-08 S

R 094E 048 x

x 94E965043

x x (( E 1800

14 Z 198.5 "0.4 00 (monzonite 094E 049 dyke) 1 A 10 K 6 00

C T v

0 C

0 94E965024

2 (( (( 1 E 094E 110 94E963420 094E 111 BLg x 1800 18 x 00 S (( 94E965023 x (( S (( 6335000 N ((94E965044 BLg 094E 127 94E963419 x x 094E 105 ((x R O A D 094E 082 Ar 094E 123 (( ( in progress ((94E963418 00 12 W r i c h L 094E 122 E TT EE S E 1800 R R 0 I R 0 0 0 0 2 I 0 F I 4 F 1 6 1 V E 1 R 94E965042 (( 0 (( 00 2

94E965022 (( 94E963430 ((

94E963417 14 1 00 200 ((

94E965034 (( 0 ((

0 2

0 1 1 2 14 600 1 00 94E965036 (( 00 16 094E 081

0 140 Cascadero References Falls 6330000 N Diakow, L.J. (2001): Geology of the Southern Toodoggone River and Northern McConnell Creek Map Areas, North-central British Columbia (Parts of NTS 94E/2, 94D/15 and 16) B.C. Ministry of Energy and Mines, Geoscience Map 2001-1, 1:50 000 scale. 0 0 0 0 4 6 1 1 094E 022 Diakow, L.J., Panteleyev, A and Schroeter, T.G. (1993): Geology of the Early Jurassic Toodoggone Formation and Gold-Silver Deposits in the Toodoggone River Map Area, 1 4 1400 0 0 Northern British Columbia; B.C. Ministry of Energy, Mines and Petroleum Resources, Bulletin 86, 72 pages with maps at 1: 100 000 scale. ((94E965035

' ' 094E 112 ' Eisbacher, G.H. (1974): Sedimentary History and Tectonic Evolution of the Sustut and Sifton Basins, North-central British Columbia; Geological Survey of Canada, Open File 483.

5 0 094E 002 5

5 5

º º º

º (( 94E965052 0

7 Gabrielse, H., Dodds, C.J., Mansy, J.L. and Eisbacher, G.H. (1977): Geology of Toodoggone River (94E) and Ware West-Half (94F); Geological Survey of Canada,Open File 483.

7 6 6

2 2 094E 119 2

2 94E965037 (( 4 625000 E 615000 E

1 1 1

800 1 1

635000 E 6 630000 E 620000 E Legun, A. (2001): Geology of the Southern McConnell Range, North-central British Columbia (Parts of 94D/9,10,15 and 16), B.C. Ministry of Energy and Mines, Open File 2001-2. Marsden, H. (1990): Stratigraphic, Structural and Tectonic Setting of the Shasta Au-Ag Deposit, North-central British Columbia; unpublished M.Sc. thesis, Carleton University, 223 pages. Monger, J.W.H (1977): The Triassic Takla Group in McConnell Creek Map Area, North-Central British Columbia, Geological Survey of Canada, Paper 76-29, 45 pages.

Acknowledgments Supplementary Datasets Map Base Information This map is the result of an initial fieldseason of a two-year bedrock mapping program in the Toodoggone River area. This program (2004, in prep) : is funded through the Federal-Provincial Targeted Geoscience Initiative ( II) and a partnership with five miningcompanies - Stealth Airborne Magnetic and Gamma Ray Spectrometric and Total Field Magnetic Survey, Parts of Toodoggone River Recommended Citation: 1:50 000 topographic base produced from TRIM 1:20 000 scale topographic database supplied by LandData B.C. North American Minerals Ltd, Finlay Minerals Ltd., Northgate Exploration Ltd. ,Bishop Resources Inc. and Sable Resources Ltd. These companies (NTS 94E/ 2,3,6,7,10 and 11) and McConnell Creek ( NTS94D/15 ) areas; B.C Ministry of Energy and Mines; Open File 2004-8. Datum (NAD) 83, Universal Transverse Mercator Projection, UTM Zone 9. Approximate mean magnetic declination (2004) are thanked for access to confidential information and for their generous support. Phu Van Bui provided excellent assistance in the field. Diakow, L.J. (2004): Geology of the Samuel Black Range Between the Finlay River and Toodoggone River, Toodoggone River Map Area, North-central British Columbia, between magnetic north and grid north is 22°52' east, decreasing about 17' annually. Elevations in metres above sea level. Harpreet Jaswal, through the University of Victoria Cooperative Education Program, completed map cartography. Jackaman, W. (1997): British Columbia Regional Geochemical Survey NTS 94E-Toodoggone River, Stream Sediment and Water Geochemical Data; B.C. Ministry of Employment and Investment, BC RGS 46. Parts of NTS 94E/2,6 and 7, B.C. Ministry of Energy and Mines, Open File Map 2004- 4, 1:50 000 scale. Jackaman, W. (1997): British Columbia Regional Geochemical Survey NTS 94D-McConnell Creek, Stream Sediment and Water Geochemical Data; B.C. Ministry of Employment and Investment, BC RGS 45. (1999): Aeromagnetic Residual Total Field Survey of Toodoggone River (NTS 94E) and Ware (NTS 94F); Geological Survey of Canada, Open File 3495, 8 sheets at 1:100 000 scale.